Carry out the following osmosis experiment: Take four peeled potato halves and scoop each one out to make potato cups. One of these potato cups should be made from a boiled potato. Put each potato cup in a trough containing water. Now, (a) Keep cup A empty (b) Put one teaspoon sugar in cup B (c) Put one teaspoon salt in cup C (d) Put one teaspoon sugar in the boiled potato cup D. Keep these for two hours. Then observe the four potato cups and answer the following: (i) Explain why water gathers in the hollowed portion of B and C. (ii) Why is potato A necessary for this experiment? (iii) Explain why water does not gather in the hollowed out portions of A and D.




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Firstly, water gathers in the portion of the set up B and C in the hollowed portion say.

The water will enter the potato as a result of osmosis, then, since the medium surrounding the cell has a higher water concentration than the cell, which means the water moves inside by osmosis.

Potato A will react as control set-up.

Water doesn’t gather in the hollowed portions of potato A, because it’s empty.

Water is not able to enter potato D because the potato D is boiled.

The boiling will disrupt the cell membrane and for osmosis, a semi-permeable membrane is required.

So the water will not enter the boiled potato cup.